A front underfloor structure of a vehicle (EV) includes a protruding member protruding downward from a front underfloor surface of the vehicle, and redirects a flow of traveling air that flows around a front underfloor while traveling. The protruding member is configured as a protruding member with curved surface (31) disposed at a position closer to the vehicle front than front tires (1L, 1R) and in a central portion of the front underfloor straddling a vehicle center line (CL). The protruding member with curved surface (31) has a circumference of protrusion in a vehicle longitudinal direction that is longest at the position of the vehicle center line (CL), and the circumference of protrusion in the vehicle longitudinal direction becomes gradually shorter with increasing distance from the vehicle center line (CL) on both sides in a vehicle width direction.